Short Answer 
To assist a customer having an allergic reaction, stay with them to provide support and monitor their symptoms closely. Call for medical help immediately and encourage the use of their epinephrine autoinjector if available, while also offering reassurance to keep the customer calm.
Step 1: Stay with the Customer
It is crucial for the food handler to remain with the customer experiencing an allergic reaction. This support ensures the individual does not feel isolated and can receive immediate assistance if their condition worsens. Monitoring their symptoms is critical as allergic reactions can escalate rapidly, potentially leading to anaphylaxis.
Step 2: Call for Medical Help
Once you are with the customer, promptly call for medical assistance. Alerting emergency services is essential, as they have the tools and expertise to handle severe allergic reactions. If available, encourage the customer to use their epinephrine autoinjector while you wait for help to arrive.
Step 3: Provide Reassurance and Monitor Condition
Reassure the customer as you wait for help, helping to keep them calm during this stressful time. Monitor their symptoms closely, looking for indicators such as difficulty breathing or swelling in the throat. Remember, actions like the Heimlich maneuver are not appropriate unless there is a choking incident occurring; focus on support and vigilance instead.